UVa 495 Fibonacci Freeze
求5000以内Fibonacci 数
代码
1 //84ms 2010-05-18 9:51:27
2 //Type: Big integer(Fibonacci)
3 //打表，对于单个数，fib[i][0]存位数，fib[i][1]~fib[i][n] 由低位到高位存，八位一存
4 #include <stdio.h>
5 #include <string.h>
6 #define EX 100000000
7 #define NL 1000
8
9 int fib[NL*5+1][140];
10
11 inline void add(int K)
12 {
13 int I;
14 int x, y;
15 int a = K-1, b = K-2;
16 y = 0;
17 for (I=1; I<=fib[a][0]; I++) {
18 x = fib[a][I] + fib[b][I] + y;
19 fib[K][I] = x % EX;
20 y = x / EX;
21 }
22 fib[K][0] = fib[a][0];
23 if (y > 0) {
24 fib[K][I] = y;
25 fib[K][0]++;
26 }
27 }
28
29 int main()
30 {
31 int K, M, I;
32 memset(fib, 0, sizeof(fib));
33 fib[0][0] = 1;
34 fib[0][1] = 0;
35 fib[1][0] = fib[1][1] = 1;
36 for (K=2; K<=5000; K++) {
37 add(K);
38 }
39 while (scanf("%d", &M) != EOF) {
40 I = fib[M][0];
41 printf("The Fibonacci number for %d is ", M);
42 printf("%d", fib[M][I]);
43 for (K=I-1; K>=1; K--) {
44 printf("%08d", fib[M][K]);
45 }
46 puts("");
47 }
48 return 0;
49 }
